Besides Colloidal Silver , you could try other anti-bacterial herbs and supplements like, olive leaf extract, grapefruit seed extract, or coconut oil.
Here is a link to a recipe for olive leaf tea //www.curezone.org/forums/fm.asp?i=206701
I have made this several times. I't helps to use exact measurements like in the recipe but it's not totally necessary. Keep the crock pot lid off center and keep the crock pot filled with water so that the temperature doesn't go to high.